Re: Additional cleanup around xterm-mouse

[Jared Finder via "Emacs development discussions." <emacs-devel@gnu.org>]

On 2020-12-27 7:36 am, Stefan Monnier wrote:
>> -@defun read-key &optional prompt
>> +@defun read-key &optional prompt all-fallbacks-disabled
> 
> FWIW, I would call it "fallbacks-disabled".

I want to distinguish it from the very similar intentioned but somewhat 
differing behaving parameter to read-key-sequence.  If I don't need to 
change read-key-sequence's behavior (see below), then I am 100% on 
board.

> Hmm... now that I think about it, I wonder if we need to make changes 
> in
> `read_key_sequence` at all, because we can instead arrange for all keys
> to be bound:
> 
>     diff --git a/lisp/subr.el b/lisp/subr.el
>     index 725722cbee..1ca1d51d44 100644
>     --- a/lisp/subr.el
>     +++ b/lisp/subr.el
>     @@ -2453,10 +2453,11 @@ memory-limit
>      ;;;; Input and display facilities.
> 
>      (defconst read-key-empty-map (make-sparse-keymap))
>     -
>     +(defconst read-key-full-map
>     +  (let ((map (make-sparse-keymap))) (define-key map [t] 'dummy) 
> map))
>      (defvar read-key-delay 0.01) ;Fast enough for 100Hz repeat rate, 
> hopefully.
> 
>     -(defun read-key (&optional prompt)
>     +(defun read-key (&optional prompt dont-fallback)
>        "Read a key from the keyboard.
>      Contrary to `read-event' this will not return a raw event but 
> instead will
>      obey the input decoding and translations usually done by
> `read-key-sequence'.
>     @@ -2468,7 +2469,8 @@ read-key
>        ;; always inherits the input method, in practice read-key does 
> not
>        ;; inherit the input method (at least not if it's based on 
> quail).
>        (let ((overriding-terminal-local-map nil)
>     -       (overriding-local-map read-key-empty-map)
>     +       (overriding-local-map
>     +        (if dont-fallback read-key-full-map read-key-empty-map))
>              (echo-keystrokes 0)
>             (old-global-map (current-global-map))
>              (timer (run-with-idle-timer
> 
> WDYT?

This needs to also avoid binding ESC as well, e.g. adding (define-key 
map [?\e] nil).  Cursory testing locally with that as well shows this 
working out well.

This assumes that ESC is the only prefix key in input-decode-map.  Is 
that an okay assumption to make?  It appears true locally on my xterm.


All other suggestions integrated into my local patch.

   -- MJF